Not sure...
When I measured the OEM shafts against Surtrack shafts..
...there were small differences.
But I didnt measure snug to the assemblies.
However the balls/races and green cup clearance were all to OEM spec..
... assuming the accuracy of my micrometer!
Me thinks re-building OEM would be easier than removing and pressing
the Surtrack assemblies onto OEM shafts.
Jo